该课题组研究人员提出并实现了一种传感方式，通过这种方式同时测量两个或多个NV中心，并且提取了其信号中的时间和空间相关性。研究人员的实验演示了基于两个氮空位NV中心的自旋-电荷读出测量相关的应用噪声，并实现了用于解开局部和非局部噪声源的频谱重建实验过程。
据介绍，金刚石中的氮空位(NV)中心是原子尺度的缺陷，可用于高灵敏度和空间分辨率的磁场感应。通常，磁场是通过对单个NV中心的连续测量进行平均，或者通过对许多NV中心的系综进行空间平均来测量，它提供的平均值不包含关于在空间或时间上分离的两点之间关系的非局部信息。
附：英文原文
Title: Nanoscale covariance magnetometry with diamond quantum sensors
Author: Jared Rovny, Zhiyang Yuan, Mattias Fitzpatrick, Ahmed I. Abdalla, Laura Futamura, Carter Fox, Matthew Carl Cambria, Shimon Kolkowitz, Nathalie P. de Leon
Issue&Volume: 2022-12-23
Abstract: Nitrogen vacancy (NV) centers in diamond are atom-scale defects that can be used to sense magnetic fields with high sensitivity and spatial resolution. Typically, the magnetic field is measured by averaging sequential measurements of single NV centers, or by spatial averaging over ensembles of many NV centers, which provides mean values that contain no nonlocal information about the relationship between two points separated in space or time. Here, we propose and implement a sensing modality whereby two or more NV centers are measured simultaneously, and we extract temporal and spatial correlations in their signals that would otherwise be inaccessible. We demonstrate measurements of correlated applied noise using spin-to-charge readout of two NV centers and implement a spectral reconstruction protocol for disentangling local and nonlocal noise sources.
DOI: ade9858
Source: https://www.science.org/doi/10.1126/science.ade9858